Ok, here's 75 rolls on advantage (on a 94% hit chance each). There's quite a lot of question marks in there, which is because I took my Tiefling Wizard again and had her attack from behindn with her staff (D6-1 damage). That means every time she rolled a 2 or less on the D6, no damage. They should REALLY change this either in the animations or otherwise, because I'm sure most confuse these no-damage rolls for misses. They are not.
As expected advantage favors Critical Hits, so nothing unusual again. For there to be a critical miss you'd need to roll TWO 1s with advantage. No big data again, but coupled with my other tests on advantage, this appears to work correctly too.
? hit 20 critical hit ? hit ? hit 16 hit ? hit 5 miss 14 hit 14 hit 17 hit ? hit 5 miss ? hit ? hit 13 hit ? hit 12 hit 18 hit 8 hit 13 hit 8 hit 13 hit 15 hit ? hit 19 hit 19 hit ? hit 12 hit 20 critical hit 6 hit ? hit ? hit ? hit 10 hit 16 hit 17 hit 6 hit 15 hit 19 hit 12 hit 7 hit 2 miss ? hit 20 critical hit 4 miss 2 miss 12 hit 18 hit ? hit 8 hit 15 hit ? hit 19 hit 16 hit 8 hit ? hit ? hit 14 hit 14 hit 15 hit 20 critical hit 8 hit 18 hit 6 hit 15 hit ? hit 10 hit 16 hit ? hit 17 hits 20 critical hit ? hit 13 hit 10 hit ? hit
TOTAL ROLLS: 75 TOTAL HITS: 70 EXPECTED TO HIT RATIO: 94% TO HIT RATIO: 93,33%